D12320VF25V Datasheet, PDF (280/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 8 I/O Ports
8.4 Port 3
8.4.1 Overview
Port 3 is a 6-bit I/O port. Port 3 pins also function as SCI I/O pins (TxD0, RxD0, SCK0, TxD1,
RxD1, and SCK1) and interrupt input pins (IRQ4, IRQ5). Port 3 pin functions are the same in all
operating modes. The interrupt input pins (IRQ4, IRQ5) are Schmitt-triggered inputs.
Figure 8.3 shows the port 3 pin configuration.
Port 3 pins
Port 3
P35(I/O)/SCK1(I/O)/ IRQ5 (input)
P34(I/O)/SCK0(I/O)/ IRQ4 (input)
P33(I/O)/RxD1 (input)
P32(I/O)/RxD0 (input)
P31(I/O)/TxD1 (output)
P30(I/O)/TxD0 (output)
Figure 8.3 Port 3 Pin Functions
8.4.2 Register Configuration
Table 8.6 shows the port 3 register configuration.
Table 8.6 Port 3 Registers
Name
Abbreviation R/W
Port 3 data direction register
P3DDR
W
Port 3 data register
P3DR
R/W
Port 3 register
PORT3
R
Port 3 open drain control register P3ODR
R/W
Notes: 1. Value of bits 5 to 0.
2. Lower 16 bits of the address.
Initial Value^*1
H'00
H'00
Undefined
H'00
Address^*2
H'FEB2
H'FF62
H'FF52
H'FF76
Rev.7.00 Feb. 14, 2007 page 246 of 1108
REJ09B0089-0700